文献类型：期刊文献

英文题名：The catalytic combustion of CH2Cl2 over SO42--TixSn1-x modified with Ru

作者：Zhao, Jian[1];Tu, Chensheng[1];Sun, Wei[1];Xia, Hangqi[1];Zhang, Hao[1];Dai, Qiguang[1];Wang, Xingyi[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China

年份：2020

卷号：10

期号：3

起止页码：742

外文期刊名：CATALYSIS SCIENCE & TECHNOLOGY

收录：;EI(收录号：20200908225135);WOS:【SCI-EXPANDED(收录号:WOS:000514293400012)】；

基金：We would like to acknowledge the National Key Research and Development Program of China (2016YFC0204300), the National Natural Science Foundation of China (21777043 and 21976056), the Natural Science Foundation of Shanghai (19ZR1412900) and Shanghai Rising-Star Program (17QB1402800).

语种：英文

外文关键词：Oxide minerals - Sulfur compounds - Catalyst activity - Redox reactions - Titanium dioxide - Reaction intermediates - Ruthenium - Ruthenium compounds - Catalysis

摘要：Ru/SO42--TixSn1-x catalysts were prepared via impregnation with an aqueous solution of RuCl3 on SO42--TixSn1-x. For the samples with a Ti/Ti + Sn ratio higher or lower than 0.6, TiO2 or SnO2-rutile existed, and both contained the Ti-O-Sn structure. The residual SO42- species as chelating or bridged bidentate complexes with the Ti4+ and Sn4+ ions promoted the acidity significantly. Ru as Ru-0 and Ru4+ was highly dispersed on the matrices as a result of the interaction between the Ru and SO42- species. Ti-O-Sn increased the surface oxygen and SO42- complexes, while Ru promoted the redox activity. In CH2Cl2 oxidation, the Ru/SO42--TixSn1-x catalysts with the Ti-O-Sn structure presented high activity with TOFs at 225 degrees C of 0.18-0.63 x 10(-3) s(-1), which could be ascribed to the synergism between SO42--Ti4+ and the active surface oxygen. At 90% conversion, the selectivity for CO2 and HCl was 90% or higher. Furthermore, the Ru/SO42--TixSn1-x catalysts maintained stable activity for 50 h in wet or dry feed without significant changes. The in situ FT-IR spectra showed that the -O-CH2-O- organic sulfate was the main intermediate in CH2Cl2 oxidation. The hydroxyl activated by surface oxygen was responsible for high activity and Cl removal.